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| | | | | Benitoite is a rare blue barium titanium silicate mineral and gemstone with the chemical formula BaTiSi?O?, best known for its striking s... | |
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| | | | | The Earth's crust is the outermost layer of our planet, composed of solid rock. The Earth's crust varies in thickness from about 5 to 70 k... | |
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| | | | | Steno's Principles of Stratigraphy are four basic principles that govern the way that sedimentary rocks are deposited and layered. They were... | |
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